This actually might not be a bad idea, and he's also approaching it more from a public-health education standpoint rather than going for an outright ban (which would be practically impossible to enforce, even apart from its obvious intrusion into private affairs).

However one does wonder whether there might be other things worth spending some of that effort on ... like the rampant crime in his city.

I have to agree with Bloomberg. Since the Walkman first appeared in 1979
there have probably been millions of users who have had their hearing damaged by personal stereos and MP3 players. There is also the issue that
all these people blasting their personal stereos are very annoying to bystanders, to say the least.

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One person with a belief is a social power equal to 99 who have only interests.- John Stuart Mill

Great, masterful races have been fighting races.
-Teddy Roosevelt

Q:How many anti-racists does it take to screw in a light bulb?
A: Ten. One to screw it in and nine to complain that the light is too white.